| Current position | |
|---|---|
| Title | Head coach |
| Team | UC Davis |
| Conference | Big West |
| Record | 52–99 |
| Biographical details | |
| Born | August 23, 1979 Santa Ana, California, U.S. |
| Playing career | |
| 1998–2000 | Texas |
| 2000 | Burlington Bees |
| 2001–2004 | Winston-Salem Warthogs |
| 2003–2004 | Charlotte Knights |
| 2003–2005 | Birmingham Barons |
| 2005 | Tulsa Drillers |
| 2005 | Colorado Springs Sky Sox |
| Position(s) | Infielder |
| Coaching career (HC unless noted) | |
| 2009–2010 | Texas (VA) |
| 2011–2012 | Sacramento State (IN/H) |
| 2013–2016 | Texas (IN/H) |
| 2017 | Sacramento State (IN/H) |
| 2018–2021 | Stanford (IN/H) |
| 2022–present | UC Davis |
| Head coaching record | |
| Overall | 52–99 |
| Tournaments | NCAA: 0–0 |
Thomas Blair Nicholson (born August 23, 1979) is a baseball coach and former infielder, who is the baseball head coach of the UC Davis Aggies. He played college baseball at Texas from 1998 to 2000 for head coach Augie Garrido.